Year	Number of
1980	32971
1981	47431
1985	1509
1986	2460
1987	800
1988	693
1989	701
1990	212
1991	16423
1992	19503
1993	37516
1994	23178
1995	14320
1996	20230
1997	20894
1998	22318
1999	26875
2000	24807
2001	23997
2002	24554
2003	25105
2004	26567
2005	27562
2006	28937
2007	29270
2008	24281
2009	26001
2010	26131
2011	19348
2012	18775
2013	19056
2014	19266
2015	18762
2016	20477
2017	20438
2018	20080
2019	19790
2020	17360